When the increment operator precedes its operand, as ++num, the expression is in __________ mode.

_____________ software shields certain applications against behaviors commonly exhibited by intrusions.

A. Malware B. Rootkit C. Antivirus D. Virus signature

Use export –n (Sobell, page 486) to unexport myvar. Show that myvar is a shell variable but is no longer in the environment.

What will be an ideal response?